Fiber-reinforced ceramic matrix composite material with ablation resistance, thermal shock resistance, high temperature and oxidation resistance coating and preparation method thereof

Abstract

The invention proposes a high-temperature anti-oxidation coating on ablation-resistant and thermal-shock-resistant fiber-reinforced ceramic matrix composites, which is characterized in that the coating is formed by CVI- SiC coating formed by CVD process after SiC reinforcement layer; or using CVD process to alternately deposit one or two ultra-high temperature ceramic layers and SiC layers in MC or MB2 on the basis of using the aforementioned SiC coating as a transition layer The formed (MC / SiC)n or (MB2 / SiC)n or (MC / MB2 / SiC)n multilayer ultra-high temperature oxidation resistant coating, 1≤n≤100, the SiC layer in the multilayer ultra-high temperature oxidation resistant coating SiC nanowires and / or SiC whiskers are formed on the surface by in-situ growth through CVD process. In addition, the invention also proposes a preparation method of the high-temperature anti-oxidation coating. The invention can be widely used in the preparation of ablation-resistant, thermal shock-resistant, high-temperature and oxidation-resistant coatings on the surface of thermal structural parts.

Description

Fiber-reinforced ceramic matrix composite material with ablation resistance, thermal shock resistance, high temperature and oxidation resistance coating and preparation method thereof technical field The invention belongs to the field of composite materials, and in particular relates to an ablation-resistant, thermal-shock-resistant, high-temperature and oxidation-resistant coating for a fiber-reinforced ceramic matrix composite material; in addition, the invention also relates to a preparation method thereof. Background technique Fiber-reinforced ceramic matrix composites (including C / C composites) are promising high-temperature thermal structural materials due to their low density, high strength, and good high-temperature stability, and have been widely used in aerospace and other fields. prospect. However, in an oxidizing atmosphere, carbon fibers begin to oxidize above 400 °C, resulting in reduced performance or even failure of the composite material. At the same time...

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Problems solved by technology

In order to overcome the shortcomings of the existing method of improving the bonding strength of the coating and the composite material substrate, improving the thermal shock resistance of the coating, and overcoming the shortcomings of the multi-layer coating prepared by the prior art, the present invention proposes a fiber-reinforced ceramic matrix composite Abrasion-resistant, thermal-shock-resistant, high-temperature, and oxidation-resistant coating on the surface of the material, and a preparation method for the coating

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